I think what New York Life did is illegal

I had New York Life long term disability benefits from January 2015 through November 2015. They did an “independent review” with a neurologist and deemed that I was able to return to work because random “syncope” was not neurological and did not prevent me from working. This is very bogus because I am NOT seeing a neurologist for my disability – I see an Electrophysiologist Cardiologist because I have a heart condition called Long QT Syndrome which causes sudden arrhythmia syncope/near syncope and can result in sudden cardiac arrest and death. I feel their denying my claim after paying me disability for 10 months is completely illegal and more illegal for them to send me to the wrong independent medical reviewer for my particular disability. I also have severe social anxiety, PTSD and depression which I see a counselor for every week due to the impact of this diagnosis and what it has done to my mental health. What can I do to appeal this decision and win?